Northern Bentbill (Oncostoma cinereigulare) [XC796923]
by Paul Driver from Pooks Hill Lodge (near Springfield), Cayo District, Belize (song)
Northern Bentbill (Oncostoma cinereigulare) [XC268532]
by Peter Boesman from Reserva de la Biosfera Selva el Ocote,Chiapas, Mexico (call)
Subspecies
Has been suggested by some authors that genus be joined with closely affiliated Hemitriccus or Lophotriccus. However, bill morphology and peculiar voice viewed by others as sufficiently distinct to support retention of separate genus. Forms a superspecies with Southern Bentbill (Oncostoma olivaceum), and sometimes considered conspecific. Distribution somewhat uncertain.